Study on the Lower Explosion Limit of Ventilation Air Methane at 700–1200℃ DOI
Zichao Huang, Wei Gao, Guoliang Li

et al.

Combustion Science and Technology, Journal Year: 2024, Volume and Issue: unknown, P. 1 - 17

Published: Dec. 10, 2024

Regenerative thermal oxidation (RTO) of Ventilation Air Methane (VAM) is an environmentally friendly technology for harnessing heat energy. Higher concentrations methane can improve utilization efficiency, but it suffers from a high risk explosion. The lower explosive limit (LEL) at temperatures 700–1200°C determined using self-designed experimental apparatus, and the mechanism LEL analyzed GRTO (Gas regenerative oxidation) model constructed by our research group. Results reveal that linear correlation between temperature within 700–1200°C. As rises, exhibits consistent decline. Furthermore, maximum concentration VAM in RTO process elucidated, with average 95.3% LEL. ·OH determines severity LEL, explosions are dominated H+O2⇔O+OH H2+ OH⇔OH+H2O. 2CH3(+M)⇔C2H6(+M) plays vital role inhibiting explosion, its inhibitory effect decreases 59.5% 1200°C compared to 700°C.

Language: Английский

Distributed High-Density Anchor (Cable) Support Force Monitoring System Research DOI Open Access
Lei Wang, Kai Sun, Junyan Qi

et al.

Electronics, Journal Year: 2024, Volume and Issue: 13(11), P. 2221 - 2221

Published: June 6, 2024

In shaft mining, monitoring the deformation of roadway due to mining pressure is great significance safe production coal mines. For this reason, a distributed high-density anchor (cable) support force system was designed by developing low-cost stress device, which consists an sensor and data acquisition device. The whole bar device mine substation. signals collected sensors are processed sent self-developed substation through Long Range Radio (LoRa) wireless communication. All from transmitted ground control center in real time via Message Queuing Telemetry Transport (MQTT) network transmission protocol. arrangement nodes reflects trend section multiple sections, effectively ensures safety roadway.

Language: Английский

Citations

2
Numerical Study on the Explosion Reaction Mechanism of Multicomponent Combustible Gas in Coal Mines DOI Creative Commons
Dong Ma, Leilin Zhang, Guangyuan Han

et al.

Fire, Journal Year: 2024, Volume and Issue: 7(10), P. 368 - 368

Published: Oct. 16, 2024

Combustible gases, such as CO, CH4, and H2, are produced during spontaneous coal combustion in goaf, which may cause an explosion under the stimulation of external fire source. It is great significance to study influence combustible CO on characteristics a gas explosion. In this study, CHEMKIN software (Version 17.0) GRI-Mech 3.0 reaction mechanism were used influences different concentration ratios between H2 ignition delay time, free radical concentration, key step The results show that increase initial CH4 concentrations prolonged while shortened time accelerated reaction. addition promoted generation radicals (H·, O·, ·OH) occurrence generated ·OH dominated methane consumption through R119 R156 reactions. As increased, R38 gradually became main driving factor

Language: Английский

Citations

0
Study on the Lower Explosion Limit of Ventilation Air Methane at 700–1200℃ DOI
Zichao Huang, Wei Gao, Guoliang Li

et al.

Combustion Science and Technology, Journal Year: 2024, Volume and Issue: unknown, P. 1 - 17

Published: Dec. 10, 2024

Regenerative thermal oxidation (RTO) of Ventilation Air Methane (VAM) is an environmentally friendly technology for harnessing heat energy. Higher concentrations methane can improve utilization efficiency, but it suffers from a high risk explosion. The lower explosive limit (LEL) at temperatures 700–1200°C determined using self-designed experimental apparatus, and the mechanism LEL analyzed GRTO (Gas regenerative oxidation) model constructed by our research group. Results reveal that linear correlation between temperature within 700–1200°C. As rises, exhibits consistent decline. Furthermore, maximum concentration VAM in RTO process elucidated, with average 95.3% LEL. ·OH determines severity LEL, explosions are dominated H+O2⇔O+OH H2+ OH⇔OH+H2O. 2CH3(+M)⇔C2H6(+M) plays vital role inhibiting explosion, its inhibitory effect decreases 59.5% 1200°C compared to 700°C.

Language: Английский

Citations

0